Shelf for supporting cans



FIG. 1 is a rear top isometric view of a shelf for supporting cans showing our new design;

FIG. 2 is a front bottom isometric view;

FIG. 3 is a side isometric view taken from the right of FIG. 1;

FIG. 4 is a front elevational view. 

The ornamental design for a shelf for supporting cans, substantially as shown and described. 